Display device

ABSTRACT

A display device is disclosed. The display device includes a housing, a plurality of rollers positioned inside the housing, a display unit including a display panel and a module cover having at least one apron, of which at least a portion is connected to each other, and a driver including a motor assembly, an upper bar coupled to an upper part of the display unit, and at least one support portion having one side coupled to both ends of the upper bar and the other side coupled to the motor assembly and moving up and down the upper bar. The display panel and the module cover are in a first state in which they are wound around the roller or a second state in which they are unwound from the roller, contact each other, and are exposed to the outside of the housing.

This application claims the benefit of Korean Patent Application No.10-2016-0113898 filed on Sep. 5, 2016, the entire contents of which areincorporated herein by reference for all purposes as if fully set forthherein.

BACKGROUND OF THE INVENTION Field of the Invention

The present disclosure relates to a display device.

Discussion of the Related Art

With the development of the information society, various demands fordisplay devices are increasing. Various display devices, such as liquidcrystal displays (LCDs), plasma display panels (PDPs),electroluminescent displays (ELDs), and vacuum fluorescent displays(VFDs), have been recently studied and used in response to the variousdemands for the display devices.

A display device using an organic light emitting diode (OLED) isadvantageous in that it has better luminance characteristic and viewingangle characteristic than a liquid crystal display, and has a ultra-thinprofile because it does not require a backlight unit unlike the liquidcrystal display.

SUMMARY OF THE INVENTION

In one aspect, there is provided a display device including a housing, aplurality of rollers positioned inside the housing, a display unitincluding a display panel and a module cover having at least one apron,of which at least a portion is connected to each other, and a driverincluding a motor assembly, an upper bar coupled to an upper part of thedisplay unit, and at least one support portion having one side coupledto both ends of the upper bar and the other side coupled to the motorassembly and moving up and down the upper bar, wherein the display paneland the module cover are in a first state in which they are wound on theroller or a second state in which they are unwound from the roller,contact each other, and are exposed to the outside of the housing, andwherein the plurality of rollers includes a panel roller winding andunwinding the display unit and an auxiliary roller that is positionedadjacent to the panel roller and moves to wind and unwind in a directionopposite to the panel roller.

The display device may further include a protective sheet positionedinside the housing and contacting the display panel while the auxiliaryroller is released.

One end of the protective sheet may be connected to the auxiliaryroller, and the other end of the protective sheet may be connected toone end of the display panel.

The protective sheet may include a nonwoven fabric.

The auxiliary roller may include a fixed cap fixed to one end of theauxiliary roller, a rotating cap positioned at the other end of theauxiliary roller and being rotatable, and a coil spring of which bothends are connected to the fixed cap and the rotating cap.

When the first state is changed to the second state, one end of the coilspring connected to the fixed cap may be fixed, and the other end of thecoil spring connected to the rotating cap may be wound while rotating.

When the first state is changed to the second state, a position of theauxiliary roller may change.

A front surface of the display panel may be closer to the auxiliaryroller in the first state than the auxiliary roller in the second state.

The auxiliary roller may move along a rail formed inside the housing.

The display device may further include a guide assembly coupled to theauxiliary roller.

The guide assembly may guide the auxiliary roller to move toward a frontsurface of the display panel.

The guide assembly may include a guide arm of which one end is connectedto the auxiliary roller, and a tension spring of which one end isconnected to the other end of the guide arm.

As the auxiliary roller moves, the guide arm may rotate.

As the auxiliary roller is away from a front surface of the displaypanel, the guide arm may rotate in a counterclockwise direction.

As the guide arm rotates, a length of the tension spring may change.

As the auxiliary roller is away from a front surface of the displaypanel, the length of the tension spring may increase.

The guide assembly may further include a pin bolt that is positioned inthe center of the guide arm and fixes the guide arm to the housing.

An extending direction of the guide arm may change with respect to thepin bolt.

When the first state is changed to the second state, the guide arm mayrotate around the pin bolt.

The guide assembly may further include a supporter that is connected tothe other end of the tension spring and is fixed to the housing.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the invention and are incorporated in and constitute apart of this specification, illustrate embodiments of the invention andtogether with the description serve to explain the principles of theinvention. In the drawings:

FIGS. 1 to 17 illustrate configuration of a display device related to anembodiment of the invention; and

FIGS. 18A, 18B to 29 illustrate a display device according to anembodiment of the invention.

DETAILED DESCRIPTION OF THE EMBODIMENTS

Reference will now be made in detail embodiments of the inventionexamples of which are illustrated in the accompanying drawings. Sincethe present invention may be modified in various ways and may havevarious forms, specific embodiments are illustrated in the drawings andare described in detail in the present specification. However, it shouldbe understood that the present invention are not limited to specificdisclosed embodiments, but include all modifications, equivalents andsubstitutes included within the spirit and technical scope of thepresent invention.

The terms ‘first’, ‘second’, etc. may be used to describe variouscomponents, but the components are not limited by such terms. The termsare used only for the purpose of distinguishing one component from othercomponents. For example, a first component may be designated as a secondcomponent without departing from the scope of the present invention. Inthe same manner, the second component may be designated as the firstcomponent.

The term “and/or” encompasses both combinations of the plurality ofrelated items disclosed and any item from among the plurality of relateditems disclosed.

When an arbitrary component is described as “being connected to” or“being linked to” another component, this should be understood to meanthat still another component(s) may exist between them, although thearbitrary component may be directly connected to, or linked to, thesecond component. In contrast, when an arbitrary component is describedas “being directly connected to” or “being directly linked to” anothercomponent, this should be understood to mean that no component existsbetween them.

The terms used in the present application are used to describe onlyspecific embodiments or examples, and are not intended to limit thepresent invention. A singular expression can include a plural expressionas long as it does not have an apparently different meaning in context.

In the present application, the terms “include” and “have” should beunderstood to be intended to designate that illustrated features,numbers, steps, operations, components, parts or combinations thereofexist and not to preclude the existence of one or more differentfeatures, numbers, steps, operations, components, parts or combinationsthereof, or the possibility of the addition thereof.

Unless otherwise specified, all of the terms which are used herein,including the technical or scientific terms, have the same meanings asthose that are generally understood by a person having ordinaryknowledge in the art to which the present invention pertains. The termsdefined in a generally used dictionary must be understood to havemeanings identical to those used in the context of a related art, andare not to be construed to have ideal or excessively formal meaningsunless they are obviously specified in the present application.

The following exemplary embodiments of the invention are provided tothose skilled in the art in order to describe the present invention morecompletely. Accordingly, shapes and sizes of elements shown in thedrawings may be exaggerated for clarity.

Hereinafter, embodiments of the invention are described using an organiclight emitting diode (OLED) display panel as an example of a displaypanel. Embodiments of the invention are not limited thereto. Otherdisplay panels may be used. For example, a plasma display panel (PDP), afield emission display (FED) panel, and a liquid crystal display panelmay be used.

FIGS. 1 to 17 illustrate configuration of a display device related to anembodiment of the invention.

As shown in FIG. 1, in the following description, a display panel 10 mayinclude a first long side LS1, a second long side LS2 opposite the firstlong side LS1, a first short side SS1 adjacent to the first long sideLS1 and the second long side LS2, and a second short side SS2 oppositethe first short side SS1.

In embodiments disclosed herein, the first short side SS1 may bereferred to as a first side area; the second short side SS2 may bereferred to as a second side area opposite the first side area; thefirst long side LS1 may be referred to as a third side area which isadjacent to the first side area and the second side area and ispositioned between the first side area and the second side area; and thesecond long side LS2 may be referred to as a fourth side area which isadjacent to the first side area and the second side area, is positionedbetween the first side area and the second side area, and is opposite tothe third side area.

Embodiments of the invention describe that lengths of the first andsecond long sides LS1 and LS2 are longer than lengths of the first andsecond short sides SS1 and SS2 for the sake of brevity and ease ofreading. However, the lengths of the first and second long sides LS1 andLS2 may be almost equal to the lengths of the first and second shortsides SS1 and SS2.

In the following description, a first direction DR1 may be a directionparallel to the long sides LS1 and LS2 of the display panel 10, and asecond direction DR2 may be a direction parallel to the short sides SS1and SS2 of the display panel 10.

A third direction DR3 may be a direction vertical to the first directionDR1 and/or the second direction DR2.

In embodiments disclosed herein, the first direction DR1 and the seconddirection DR2 may be commonly referred to as a horizontal direction.Further, the third direction DR3 may be referred to as a verticaldirection.

In addition, a side or a surface, on which a display device 100 displaysan image, may be referred to as a front side or a front surface. Whenthe display device 100 displays the image, a side or a surface, at whichthe image cannot be observed, may be referred to as a back side or aback surface. When the display device 100 is observed at the front sideor the front surface, the first long side LS1 may be referred to as anupper side or an upper surface. In the same manner as the first longside LS1, the second long side LS2 may be referred to as a lower side ora lower surface. Further, the first short side SS1 may be referred to asa left side or a left surface, and the second short side SS2 may bereferred to as a right side or a right surface.

Further, the first long side LS1, the second long side LS2, the firstshort side SS1, and the second short side SS2 may be referred to asedges of the display device 100. Positions where the first long sideLS1, the second long side LS2, the first short side SS1, and the secondshort side SS2 meet one another may be referred to as corners. Forexample, a position where the first long side LS1 and the first shortside SS1 meet each other may be referred to as a first corner C1; aposition where the first long side LS1 and the second short side SS2meet each other may be referred to as a second corner C2; a positionwhere the second short side SS2 and the second long side LS2 meet eachother may be referred to as a third corner C3; and a position where thesecond long side LS2 and the first short side SS1 meet each other may bereferred to as a fourth corner C4.

In embodiments disclosed herein, a direction from the first short sideSS1 to the second short side SS2 or a direction from the second shortside SS2 to the first short side SS1 may be referred to as a left-rightdirection LR. A direction from the first long side LS1 to the secondlong side LS2 or from the second long side LS2 to the first long sideLS1 may be referred to as an up-down direction UD.

Referring to FIG. 2, the display device 100 according to the embodimentof the invention may include a display unit 20 and a housing 30.

The display unit 20 may include the display panel 10 and a module cover15. The display panel 10 may be provided on a front surface of thedisplay device 100 and may display an image. The display panel 10 maydivide an image into a plurality of pixels and output the image bycontrolling the light emission in accordance with color, brightness, andchroma of each pixel. The display panel 10 may be divided into an activearea, in which an image is displayed, and an inactive area, in which noimage is displayed.

The display panel 10 may have a rectangular shape. However, embodimentsof the invention are not limited thereto. For example, the display panel10 may have a shape in which an edge has a predetermined curvature. Thedisplay panel 10 may be an OLED display panel. Other display panels maybe used. For example, a liquid crystal display panel may be used.

The module cover 15 may be provided on a back surface of the displaypanel 10. The module cover 15 may be directly attached to the displaypanel 10. A size of the module cover 15 may be equal to or greater thana size of the display panel 10.

The module cover 15 may support the back surface of the display panel10. Hence, the module cover 15 may include a lightweight material withhigh rigidity. For example, the module cover 15 may include aluminum.

The housing 30 may be provided on a back surface of the display unit 20.Namely, the housing 30 may be provided on a back surface of the modulecover 15. The housing 30 may shield at least one printed circuit board(PCB). Namely, the housing 30 may cover at least one PCB attached to theback surface of the module cover 15. A detailed coupling structure and acoupling method of at least one PCB are described below.

The housing 30 may receive electromagnetic waves emitted from at leastone PCB. Hence, although not shown, the housing 30 may include an innerhousing made of a conductive material and an outer housing covering theinner housing. However, embodiments of the invention are not limitedthereto. For example, the housing 30 may be configured as one body madeof a conductive material.

Referring to FIG. 3, in the display device 100 according to theembodiment of the invention, the housing 30 may be positioned under thedisplay unit 20. More specifically, the housing 30 may have a shapesurrounding a lower part of the display unit 20. Namely, the housing 30may be configured not to expose various driving devices or drivingcircuits positioned inside the housing 30 to the outside.

A width of the housing 30 in the first and third directions may begreater than a width of the display unit 20 in the first and thirddirections in order to protect the display unit 20 therein. A width ofthe housing 30 in the second direction may be less than a width of thedisplay unit 20 in the second direction because the housing 30interferes with the view of a user.

The housing 30 may not be positioned in the active area of the displayunit 20. Hence, the users can be immersed in the screen of the thinnerdisplay unit 20.

Referring to FIG. 4, the display device 100 according to the embodimentof the invention may be in a first state, in which the active area ofthe display unit 20 is positioned inside the housing 30, or a secondstate in which the active area of the display unit 20 is exposed to theoutside of the housing 30.

When the display device 100 is in the first state, the active area ofthe display unit 20 may be positioned inside the housing 30. Namely, thedisplay unit 20 may be shielded by the housing 30 in the first state.

When the display device 100 is in the second state, the active area ofthe display unit 20 may be exposed to the outside of the housing 30.Namely, at least a portion of the display unit 20 may protrude to anupper part of the housing 30 in the second state.

Although not shown, the display unit 20 may change from the first stateto the second state by a roller positioned inside the housing 30. Morespecifically, the display unit 20 may change from the first state, inwhich the display unit 20 is wound by the roller, to the second state inwhich the display unit 20 is unwound by the roller and is exposed to theoutside. On the contrary, the display unit 20 may change from the secondstate to the first state when the display unit 20 is wound by theroller. A structure and an operation method of the roller and thedisplay unit 20 are described in detail below.

The display unit 20 of the display device 100 according to theembodiment of the invention may be in the first state or the secondstate. Thus, the user can expose the display unit 20 to the outside ofthe housing 30 only when viewing the display device 100, thereby savingspace.

Referring to FIG. 5, a panel roller 143 may be connected to one end ofthe display panel 10. The panel roller 143 may wind or unwind thedisplay panel 10 so that the display panel 10 is in the first state orthe second state.

In the display device according to the embodiment of the invention, atleast one source PCB 120 may be positioned on at least a portion of afront surface of the display panel 10. For example, a plurality ofsource PCBs 120 may be positioned to be spaced apart from one another.

Signal lines may be positioned on at least one source PCB 120 and maytransmit digital video data and timing control signals received from atiming controller board 105. The source PCB 120 may be connected to thedisplay panel 10 by a source chip-on film (COF) 123. The source COF 123connected to one side of the source PCB 120 may be extended to theactive area of the display panel 10 and connected to the display panel10.

A seating portion 379 may be positioned on the outer periphery of thepanel roller 143. The seating portion 379 may form an accommodationspace 13 by stepping a portion of the outer periphery of the panelroller 143. The seating portion 379 may be positioned at a contactportion between the source PCB 120 and the panel roller 143 when thepanel roller 143 is wound or released. The seating portion 379 may havea shape in which at least a portion of the outer periphery of the panelroller 143 is depressed.

When the panel roller 143 is wound, the source PCB 120 may be placed inthe seating portion 379, and at least a portion of the source PCB 120may contact the panel roller 143. Hence, even when the panel roller 143is wound, the source PCB 120 may not be damaged.

The timing controller board 105 may be mounted inside the panel roller143. A flexible flat cable (FFC) 117 connected to the source PCB 120 canbe prevented from being twisted by mounting the timing controller board105 inside the panel roller 143.

The panel roller 143 may include an upper panel roller 331 and a lowerpanel roller 337. The upper panel roller 331 and the lower panel roller337 may be coupled to each other by at least one screw. The timingcontroller board 105 may be mounted between the upper panel roller 331and the lower panel roller 337. At least one screw may couple the upperpanel roller 331 to the lower panel roller 337 and also couple them tothe timing controller board 105. The FFC 117 may be connected to thetiming controller board 105 and the source PCB 120 through a hole 331 apositioned in the upper panel roller 331.

Because the timing controller board 105 rotates together with the panelroller 143, the FFC 117 may be coupled to the timing controller board105 and the source PCB 120 without being twisted. Further, space can besaved because the timing controller board 105 is mounted inside thepanel roller 143.

Referring to FIG. 6, the timing controller board 105 may be mountedinside the panel roller 143 at one side of the housing 30 with respectto the center of the housing 30 in which the display panel moves up anddown, and a power supply board 107 and a main board 109 may bepositioned at the other side of the housing 30.

The timing controller board 105 may be connected to the power supplyboard 107 and the main board 109. The timing controller board 105 may beconnected to the power supply board 107 and the main board 109 through awiring electrode 113. More specifically, the wiring electrode 113 mayinclude a first wiring electrode 307 connecting the timing controllerboard 105 to the power supply board 107 and a second wiring electrode309 connecting the timing controller board 105 to the main board 109.

For example, a plurality of first wiring electrodes 307 may be disposed.The first wiring electrode 307 may have a circular shape. The firstwiring electrode 307 may connect the timing controller board 105 to thepower supply 107 through an opening in the center of a rotation axis ofthe panel roller 143.

The second wiring electrode 309 may use the FFC 117 connected to thetiming controller board 105 and the source PCB 120. The second wiringelectrode 309 may connect the timing controller board 105 to the mainboard 109 through an opening in the center of the rotation axis of thepanel roller 143.

The first wiring electrode 307 and the second wiring electrode 309 maybe positioned on the opposite sides of the timing controller board 105.The openings of the first wiring electrode 307 and the second wiringelectrode 309 may be positioned on the opposite sides of the timingcontroller board 105.

In the display device according to the embodiment of the invention, thetiming controller board 105 may be mounted on the panel roller 143, andthe power supply board 107 and the main board 109 may be positioned onthe opposite side of the display panel. Hence, an inner space of thehousing 30 can be considerably saved.

Referring to FIG. 7, the display device according to the embodiment ofthe invention may include the panel roller 143, a motor assembly 137,and a support portion 73 inside the housing 30.

The panel roller 143 may be positioned in front of a portion of thehousing 30 in which the display unit 20 moves up and down. The panelroller 143 may simultaneously wind and unwind the display panel 10 andthe module cover 15. Because the module cover 15 is thick, a diameter ofthe panel roller 143 may greatly increase when the display unit 20changes from the second state to the first state. Thus, the panel roller143 may be spaced apart from each surface of the housing 30 by apredetermined distance or more.

The support portion 73 may be positioned at a portion in which thedisplay unit 20 moves up and down. The support portion 73 may functionto support the display panel 10 and the module cover 15 so that they canmove up and down. More specifically, the support portion 73 may move upand down an upper bar (not shown) coupled to the upper parts of themodule cover 15 and the display panel 10. A driving method of thesupport portion 73 is described in detail below.

Because only the upper parts of the module cover 15 and the displaypanel 10 are connected to the upper bar, other parts may easily bend.Thus, the support portion 73 may support the module cover 15 so that themodule cover 15 does not bend at the back surface of the module cover15. Because the support portion 73 continues to move when the displayunit 20 changes from the first state to the second state, the supportportion 73 may not be coupled to the module cover 15, but may supportthe module cover 15.

The motor assembly 137 may be positioned at a portion to which thesupport portion 73 is connected. The motor assembly 137 may drive thesupport portion 73 so that the support portion 73 moves up or down. Themotor assembly 137 may receive an electrical signal and may convert theelectrical signal into a physical force. The motor assembly 137 maytransfer rotational energy to the support portion 73 and change thedisplay unit 20 from the first state to the second state. A structureand a driving principle of the motor assembly 137 are described indetail below.

The display device according to the embodiment of the invention cansimultaneously wind and unwind the display panel 10 and the module cover15 using one roller. Hence, the user can enjoy the screen better by areduction in a thickness of the housing 30.

Referring to FIG. 8, the module cover 15 may include a plurality ofaprons 15 a. The apron may have a rectangular shape. The aprons 15 a maybe spaced apart from one another and attached to the back surface of thedisplay panel 10. Because the module cover 15 includes the plurality ofaprons 15 a, a shape of the module cover 15 may be easily changed whenthe module cover 15 is wound or unwound by the roller. The module cover15 may include a plastic material or an aluminum material. Hence, themodule cover 15 may protect the display panel 10 from an externalimpact.

The display panel 10 and the module cover 15 may be coupled to eachother through adhesive layers 70. The adhesive layer 70 may be adouble-sided tape. The display panel 10 and the module cover 15 may bewound or unwound together by the adhesive layers 70. The adhesive layer70 may be positioned on each apron and attached to the display panel 10.The adhesive layers 70 may be spaced apart from one another. Hence, theshape of the module cover 15 may be easily changed when the module cover15 is wound or unwound by the roller. As a width of the adhesive layer70 in the second direction decreases, the deformation of the displaypanel 10 against an external force may decrease. More specifically, asthe width of the adhesive layer 70 in the second direction decreases,the external force transferred to the display panel 10 may decreasebecause the flexibility of the display panel 10 is improved.

As a width of the apron in the second direction increases, a crack maynot be formed on the display panel 10. More specifically, as the widthof the apron in the second direction increases, the crack may not beformed on the display panel 10 because rigidity of the display panel 10is improved.

Hence, when the width of the adhesive layer 70 in the second directionis equal to or less than 30% of the width of the apron in the seconddirection, the display screen may be less uneven because the externalforce transferred to the display panel 10 decreases.

Further, when the width of the adhesive layer 70 in the second directionis equal to or greater than 15% of the width of the apron in the seconddirection, the display panel 10 may have less cracks because therigidity of the display panel 10 is improved.

As a width of the adhesive layer 70 in the third direction increases,the deformation of the display panel 10 against an external force maydecrease. More specifically, as the width of the adhesive layer 70 inthe third direction increases, the external force transferred to thedisplay panel 10 may decrease because the flexibility of the displaypanel 10 is improved.

Further, as a width of the apron in the third direction decreases, acrack may not be formed on the display panel 10. More specifically, asthe width of the apron in the third direction decreases, the crack maynot be formed on the display panel 10 because the rigidity of thedisplay panel 10 is improved.

Hence, when the width of the adhesive layer 70 in the third direction isequal to or greater than 3% of the width of the apron in the thirddirection, the display screen may be less uneven because the externalforce transferred to the display panel 10 decreases.

Further, when the width of the adhesive layer 70 in the third directionis equal to or less than 6% of the width of the apron in the thirddirection, the display panel 10 may have less cracks because therigidity of the display panel 10 is improved.

In the display device according to the embodiment of the invention, themodule cover 15 may include the plurality of aprons 15 a, and theadhesive layer 70 may be positioned on each apron. Hence, when themodule cover 15 is wound on the roller, the shape of the module cover 15having the above-described configuration may be more easily changed thanwhen the module cover 15 is configured as one body.

Referring to FIG. 9A, the module cover 15 and the display panel 10 maybe fastened to an upper bar 75. More specifically, the module cover 15and the display panel 10 may be fastened to the upper bar 75 by at leastone screw 115.

When the upper bar 75 moves up and down, at least one screw 115 canprevent the module cover 15 and the display panel 10 from being detachedfrom the upper bar 75 and allow the module cover 15 and the displaypanel 10 to move up and down together with the upper bar 75. At leastone screw 115 may fasten the upper bar 75 to the module cover 15, and atleast one screw 115 may fasten the upper bar 75 to the display panel 10.However, embodiments of the invention are not limited thereto. Forexample, at least one screw 115 may fasten the upper bar 75 to themodule cover 15 and the display panel 10 together.

In order to couple the module cover 15 to the upper bar 75, an uppermodule cover 15 t may have a different shape from other portions of themodule cover 15. The upper module cover 15 t may be an uppermost apronpositioned at the top. More specifically, the uppermost apron may have adifferent shape from that of other aprons 15 a. A thickness of at leasta portion of the upper module cover 15 t in the third direction may bedifferent from that of another portion of the upper module cover 15 t inthe third direction. The at least a portion of the upper module cover 15t having a different thickness may be inserted into a groove of theupper bar 75.

The at least a portion of the upper module cover 15 t having thedifferent thickness may be fastened to the upper bar 75 through at leastone screw 115. Because the at least a portion of the upper module cover15 t is inserted into the groove of the upper bar 75, the module cover15 can be more strongly fastened to the upper bar 75.

As shown in FIG. 9B, a top case 167 may cover the upper bar 75, themodule cover 15, and the display panel 10. The top case 167 may shieldan upper part and both sides of each of the upper bar 75, the modulecover 15, and the display panel 10. At least one screw 115 may fastenthe top case 167 to the upper bar 75, the module cover 15, and thedisplay panel 10 together.

In the display device according to the embodiment of the invention, theupper bar 75 may be coupled to the module cover 15 and the display panel10. Hence, the module cover 15 and the display panel 10 can be preventedfrom being detached from the upper bar 75 and easily move up and down.

Further, in the display device according to the embodiment of theinvention, the top case 167 may cover the upper bar 75, the module cover15, and the display panel 10. Hence, the user can feel that the displaydevice has a neater appearance.

Referring to FIG. 10, the display device according to the embodiment ofthe invention may be in a shape in which both sides of the upper bar 75are supported by the support portion 73. The upper bar 75 may be movedup and down by the support portion 73. The support portion 73 mayinclude an upper link 73 a and a lower link 73 b.

The upper link 73 a and the lower link 73 b may be connected to eachother by a hinge 152. One end of the upper link 73 a may be fastened tothe upper bar 75, and the other end may be fastened to the hinge 152.One end of the lower link 73 b may be fastened to the motor assembly137, and the other end may be fastened to the hinge 152.

A guide bar 234 may be positioned at an entrance where the supportportion 73 enters and exits the inside of the housing 30 while moving upand down. The guide bar 234 may include first and second guide bars 234a and 234 b. The first and second guide bars 234 a and 234 b may faceeach other with the support portion 73 interposed between them. Forexample, the first guide bar 234 a may be positioned in front of thesupport portion 73, and the second guide bar 234 b may be positioned inthe rear of the support portion 73.

The panel roller 143 may be positioned at a front lower end of thesupport portion 73. At least one bracket 221 may be positioned on aportion of a bottom surface of the housing 30 corresponding to the panelroller 143. Namely, at least one bracket 221 may be positioned under thepanel roller 143. The brackets 221 may be spaced apart from one another.At least one bracket 221 may be fixed to the bottom surface of thehousing 30 through a screw.

The display device according to the embodiment of the invention mayinclude various structures for the drive therein. Thus, even if thedisplay panel is moved up and down by the roller, the risk of failure ofthe display device can be reduced.

Referring to FIG. 11, the display device according to the embodiment ofthe invention may further include an apron roller 141 as well as thepanel roller 143 inside the housing 30. The panel roller 143 may bepositioned in front of the support portion 73, and the apron roller 141may be positioned in the rear of the support portion 73. Namely, thepanel roller 143 and the apron roller 141 may face each other with thesupport portion 73 interposed between them.

The panel roller 143 may wind and unwind the display panel 10, and theapron roller 141 may wind and unwind the module cover 15. In thisinstance, because the display panel 10 and the module cover 15 are woundand unwound by different rollers, they may not be attached to each otherby the adhesive layer.

Because the module cover 15 is thicker than the display panel 10, themodule cover 15 may occupy a lot of space inside the housing 30. Thus,the motor assembly 137 may be positioned in front of the support portion73 so that it does not interfere with the winding and the unwinding ofthe module cover 15. However, embodiments of the invention are notlimited thereto. For example, the motor assembly 137 may be positionedin the rear of the support portion 73.

Because the display panel 10 and the module cover 15 are dividedly woundand unwound inside the housing 30, a winding/unwinding force of thepanel roller 143 and the apron roller 141 may be greater than anadhesive force between the display panel 10 and the module cover 15.

The display device according to the embodiment of the invention can windand unwind the display panel 10 and the module cover 15 using tworollers. Hence, the display panel 10 and the module cover 15 can beprevented from hanging because a smaller weight is applied to eachroller.

Referring to FIG. 12, in the display device according to the embodimentof the invention, the panel roller 143 and the apron roller 141 may bepositioned on the same side. For example, the panel roller 143 and theapron roller 141 may be positioned in the rear of the support portion73. However, embodiments of the invention are not limited thereto. Forexample, the panel roller 143 and the apron roller 141 may be positionedin front of the support portion 73.

The apron roller 141 may be positioned under the panel roller 143.Because the module cover 15 is relatively thick, a diameter of the apronroller 141 may greatly increase when the module cover 15 is changed fromthe second state to the first state. Thus, the apron roller 141 may bespaced apart from the panel roller 143 by a first distance PGD or moreso that the apron roller 141 does not contact the panel roller 143. Thefirst distance PGD may be more than a distance that the apron roller 141cannot contact the panel roller 143 when the module cover 15 is in thefirst state.

A guide roller 145 may be positioned on a line on which the apron roller141 is released. The guide roller 145 may guide a location of the modulecover 15 so that the guide roller 145 does not contact the panel roller143 when the module cover 15 is in one of the first state and the secondstate. The guide roller 145 may be positioned under the panel roller 143so that the module cover 15 does not contact the panel roller 143.

In the display device according to the embodiment of the invention, thepanel roller 143 and the apron roller 141 may be positioned not tocontact each other at the same side (for example, the upper and lowersides). Thus, space can be saved more than when the panel roller 143 andthe apron roller 141 are positioned at the different sides.

Referring to FIG. 13, in the display device according to the embodimentof the invention, a pressure roller 147 may be positioned instead of theguide roller 145. The pressure roller 147 may press the module cover 15so that the module cover 15 contacts the support portion 73. Hence, themodule cover 15 may not bend and may maintain a flat state. The pressureroller 147 may be positioned adjacent to the support portion 73 in thethird direction so that the module cover 15 contacts the support portion73. The pressure roller 147 may also function to guide the module cover15 so that the module cover 15 and the panel roller 143 do not contacteach other.

In the display device according to the embodiment of the invention, thepressure roller 147 can press the module cover 15 so that the modulecover 15 contacts the support portion 73. Hence, the users can be moreimmersed in the flat display panel 10.

Referring to FIG. 14, in the display device according to the embodimentof the invention, both a guide roller 145 and a pressure roller 147 maybe positioned. Thus, the module cover 15 may not contact the panelroller 143 and may contact the support portion 73. As a result,malfunction of the display device can be reduced, and the users canenjoy an image of the flat display panel 10.

Referring to FIG. 15, in the display device according to the embodimentof the invention, a third module cover 15 c positioned on both sides ofthe module cover 15 may be attached to the display panel 10.

The third module cover 15 c and the display panel 10 may be attached bya magnet 64 positioned on at least one apron. The magnet 64 may beattached to the apron using a double-sided tape. The magnet 64 may bepositioned on each apron and attached to the display panel 10. Themagnets 64 may be spaced apart from each other. Hence, the shape of themodule cover 15 can be easily changed when the module cover 15 is woundor unwound by the roller.

The display panel 10 may be attached to the magnets 64. A surface of thedisplay panel 10 contacting the magnets 64 may include Fe—Ni Invaralloy. Thus, the display panel 10 can be strongly attached to themagnets 64.

Because the display panel 10 and the module cover 15 are attached by themagnets 64 positioned only on both sides of the module cover 15, a largenumber of magnets 64 are not needed. As a result, the manufacturing costof the display device can be reduced.

Referring to FIG. 16, the magnet 64 may be positioned inside a recess118 of the third module cover 15 c.

The recess 118 may be positioned on a surface of the third module cover15 c facing the display panel 10. The recess 118 may be positioned oneach apron. Because the magnet 64 is positioned inside the recess 118, asurface of the apron contacting the display panel 10 may be flat. As aresult, the thickness of the display device can be reduced, and theappearance of the display device can be neater.

Referring to FIG. 17, as the display device according to the embodimentof the invention is changed from the first state to the second state,the upper bar 75 may move up. As the support portion 73 positioned atboth ends of the upper bar 75 pushes the upper bar 75 up and down, theupper bar 75 may move up and down.

As shown in (a) of FIG. 17, when the display device is in the firststate, an angle HRA between the upper link 73 a and the lower link 73 bmay be very small. Hence, the upper bar 75 may not move up. Further, thedisplay panel 10 and the module cover 15 may be wound on the panelroller 143.

As shown in (b) of FIG. 17, as the motor assembly 137 rotates, the angleHRA between the upper link 73 a and the lower link 73 b may increase. Asthe angle HRA between the upper link 73 a and the lower link 73 bincreases, the upper bar 75 may move up. Hence, the display panel 10 andthe module cover 15, that have been wound on the panel roller 143, maybe gradually unwound.

As shown in (c) of FIG. 17, when the display device is in the secondstate, the upper link 73 a and the lower link 73 b may be positioned inparallel with each other in a straight line. Namely, the angle HRAbetween the upper link 73 a and the lower link 73 b may be 180 degrees.Thus, the upper bar 75 may move up to a highest height. Further, thedisplay panel 10 and the module cover 15 may be unwound from the panelroller 143.

FIGS. 18 to 29 illustrate a display device according to an embodiment ofthe invention.

Referring to FIGS. 18A and 18B, in the display device according to theembodiment of the invention, both ends of the module cover 15 may bendin a forward direction. Namely, both ends of at least one apron 15 b maybend in the forward direction.

The display panel 10 may be attached to an unbent portion of the modulecover 15. A bending length of both ends of the module cover 15 in theforward direction may be greater than a sum of thicknesses of thedisplay panel 10 and the adhesive layer 70. Namely, a bent portion ofthe module cover 15 may protrude more than the display panel 10 by apredetermined distance AD1 in the forward direction. Thus, the displaypanel 10 may not be exposed when viewed from the side.

As shown in FIG. 18A, the whole of the display panel 10 may be attachedto the module cover 15. In this instance, an adhesive strength betweenthe module cover 15 and the display panel 10 may be very strong. Hence,the module cover 15 and the display panel 10 may not be easily detachedfrom each other.

As shown in FIG. 18B, both ends of the display panel 10 may be attachedto the module cover 15. In this instance, the manufacturing cost can bereduced, compared to when the adhesive layer 70 is entirely attachedbetween the display panel 10 and the module cover 15.

FIGS. 18A and 18B illustrate that the display panel 10 and the modulecover 15 are attached to each other by the adhesive layer 70, by way ofexample. However, embodiments of the invention are not limited thereto.For example, the display panel 10 and the module cover 15 may beattached to each other by a magnet.

Referring to FIG. 19, in the display device according to the embodimentof the invention, a bead 136 may be formed on an upper surface of theapron 15 b. The bead 136 may have a shape depressed to the inside of theapron 15 b. At least one bead 136 may be formed on the apron 15 b. Forexample, the beads 136 may be spaced apart from each other. The bead 136can improve rigidity of the apron 15 b. For example, the bead 136 canprevent the apron 15 b from being deformed by an external impact.

Referring to FIG. 20, in the display device according to the embodimentof the invention, the source PCB 120 may be positioned on an upper sideof the module cover 15. Namely, when the module cover 15 is changed fromthe first state to the second state, a position of the source PCB 120may vary depending on the movement of the module cover 15. Thus, a spacefor connection of the source PCB 120 and the timing controller board 105mounted on the panel roller 143 may be required.

A formation space of a flexible flat cable (FFC) 231 may be requiredbetween the module cover 15 and the display panel positioned in front ofthe module cover 15. A detailed description thereof will be given later.FIG. 20 illustrates that the FFC 231 is positioned in the center of themodule cover 15 with respect to the first direction, by way of example.However, embodiments of the invention are not limited thereto. Forexample, the FFC 231 may be positioned at both ends of the module cover15 with respect to the first direction.

Referring to FIG. 21, the apron may include a depression 425 formed bydepressing backward a front center portion of the apron with respect tothe first direction. The depression 425 may be a portion where the FFC231 is positioned. Namely, the depression 425 may form a space betweenthe display panel 10 and the module cover 15. The depression 425 mayimprove the rigidity of the apron 15 b.

The bead 136 may be positioned on the apron except a formation portionof the depression 425. The bead 136 may not be positioned in theformation portion of the depression 425 because a thickness of the apronin the third direction decreases. However, embodiments of the inventionare not limited thereto. For example, the bead 136 may be positioned inthe formation portion of the depression 425.

Referring to FIG. 22, the apron 15 e may have a penetrating portion 437positioned in the center with respect to the first direction. Thepenetrating portion 437 may penetrate a central portion of the apron 15e in the second direction. Namely, the penetrating portion 437 may be ahole positioned inside the apron 15 c. The penetrating portion 437 maybe a portion where the FFC 231 is positioned. Because the penetratingportion 437 is formed inside the apron 15 e, the space can be savedcompared to when the FFC 231 is positioned in the depression 425.Namely, the thickness of the display device can be reduced.

The bead 136 may be positioned on the apron 15 e except a formationportion of the penetrating portion 437. The bead 136 may not bepositioned in the formation portion of the penetrating portion 437because the thickness of the apron 15 e in the third directiondecreases. However, embodiments of the invention are not limitedthereto. For example, the bead 136 may be positioned in the formationportion of the penetrating portion 437.

Referring to FIG. 23, in the display device according to the embodimentof the invention, the top case 167 may shield the source PCB 120 and theupper bar 75 as well as the display panel 10 and the module cover 15.Thus, the user can feel that the appearance of the display device isneat because the source PCB 120 is not exposed to the outside.

One surface of the upper bar 75 may be coupled to the back surface ofthe module cover 15, and the other surface of the upper bar 75 may becoupled to the source PCB 120. The upper bar 75 may be fixed to themodule cover 15 and may support the source PCB 120.

A lower end of the FFC 231 may be connected to the timing controllerboard 105 (see FIG. 29) inside the panel roller 143 (see FIG. 29). TheFFC 231 and the display unit 20 may be wound on and unwound from thepanel roller 143.

A portion of the FFC 231 may be positioned between the display panel 10and the module cover 15. The portion of the FFC 231 between the displaypanel 10 and the module cover 15 may be referred to as a first portion231 a. The first portion 231 a may be positioned in a depression 425, inwhich a plurality of aprons 15 d is formed. Or, the first portion 231 amay be accommodated in the depression 425, in which the plurality ofaprons 15 d is formed.

A portion of the FFC 231 may penetrate an apron 15 f. The portion of theFFC 231 penetrating the apron 15 f may be referred to as a secondportion 231 b. The apron 15 f may include a first hole 521 a formed at afront surface and a second hole 521 b formed at a back surface. Thefirst hole 521 a and the second hole 521 b may communicate with eachother to form one hole 521. The hole 521 may penetrate the apron 15 f inthe third direction. The second portion 231 b may penetrate the hole521. The hole 521 may be referred to as a connection hole 521.

An upper end of the FFC 231 may be electrically connected to the sourcePCB 120. A portion of the FFC 231 may be positioned on a back surface ofthe module cover 15. The portion of the FFC 231 on the back surface ofthe module cover 15 may be referred to as a third portion 231 c. Thethird portion 231 c may be electrically connected to the source PCB 120.

The third portion 231 c may be shielded by the top case 167. Hence, thethird portion 231 c may not be exposed to the outside.

A portion of the FFC 231 exposed to the back surface of the module cover15 may be shielded by the top case 167. Thus, only the top case 167, thedisplay panel 10, and the module cover 15 may be exposed when viewedfrom the outside.

Referring to FIG. 24, in the display device according to the embodimentof the invention, the FFC 231 may be connected to the timing controllerboard 105 mounted on the panel roller 143. A through hole 615 may bepositioned in the panel roller 143 so that the FFC 231 is connected tothe timing controller board 105 through the panel roller 143. Thethrough hole 615 may be positioned on one side of the panel roller 143and may penetrate an outer peripheral portion of the panel roller 143.The FFC 231 may be connected to one side of the timing controller board105 through the through hole 615.

In the display device according to the embodiment of the invention, evenwhen the FFC 231 is positioned on the outer periphery of the panelroller 143, the connection between the FFC 231 and the timing controllerboard 105 can be maintained by the through hole 615. Hence, the FFC 231can rotate together with the panel roller 143 and cannot be twisted.

A portion of the FFC 231 may be wound on the panel roller 143. Theportion of the FFC 231 wound on the panel roller 143 may be referred toas a fourth portion 231 d. The fourth portion 231 d may contact an outerperipheral surface of the panel roller 143.

A portion of the FFC 231 may penetrate a through hole 615. The portionof the FFC 231 penetrating the through hole 615 may be referred to as afifth portion 231 e.

The lower end of the FFC 231 may be electrically connected to the timingcontroller board 105. A portion of the FFC 231 may be positioned insidethe panel roller 143. The portion of the FFC 231 positioned inside thepanel roller 143 may be referred to as a sixth portion 231 f. The sixthportion 231 f may be electrically connected to the timing controllerboard 105.

Referring to FIG. 25, the supports 73 may be connected to both ends ofthe upper bar 75. A coupling hole 77 positioned in the upper link 73 aof the support portion 73 may be coupled with a link bracket 277 coupledto a connecting portion 275 of the upper bar 75. The link bracket 277may be positioned outside the top case 167. The link bracket 277 maycouple the upper link 73 a to the connecting portion 275 through atleast one screw.

Because the support portion 73 is positioned on the back surface of themodule cover 15, the support portion 73 may not be conspicuous to theuser. Thus, the support portion 73 may not be a problem when the userviews the display screen.

The display device according to the embodiment of the invention cangreatly save space because all of the module cover 15, the source PCB120, and the support portion 73 are connected to the upper bar 75.

Referring to FIG. 26, the display device according to the embodiment ofthe invention may further include an auxiliary roller 556 as well as thepanel roller 143. One end of the auxiliary roller 556 may be connectedto a protective sheet 472. One end of the protective sheet 472 may beconnected to the auxiliary roller 556, and the other end may beconnected to one end of the display panel 10. The auxiliary roller 556may wind or unwind the protective sheet 472 such that the protectivesheet 472 is in a wound state or an unwound state. For example, theprotective sheet 472 may include a nonwoven fabric.

The auxiliary roller 556 may be positioned adjacent to a portion wherethe panel roller 143 rotates to wind and unwind. The auxiliary roller556 may rotate in the direction opposite to the panel roller 143.Namely, when the panel roller 143 unwinds the display panel 10, theauxiliary roller 556 may wind the protective sheet 472. Further, whenthe panel roller 143 winds the display panel 10, the auxiliary roller556 may unwind the protective sheet 472.

As shown in (a) of FIG. 26, in a display device according to a relatedart, as a panel roller 143 rotates to wind and unwind, a module cover 15and a display panel 10 were in contact with each other. As a result, acrack may be formed.

On the other hand, as shown in (b) of FIG. 26, the display deviceaccording to the embodiment of the invention may be configured such thatthe display panel 10 is wound, and at the same time the protective sheet472 of the auxiliary roller 556 is unwound. Thus, the protective sheet472 can prevent the module cover 15 and the display panel 10 from beingin contact with each other. Namely, a crack may not be formed on thedisplay panel 10. The user can enjoy a clean screen because theprotective sheet 472 protects the display panel 10.

Referring to FIG. 27, the auxiliary roller 556 may include a fixed cap521, a rotating cap 523, a shaft 547, a coil spring 573, and a rollercover 582.

The fixed cap 521 may be positioned at one end of the auxiliary roller556. The fixed cap 521 may be positioned at a central axis of theauxiliary roller 556. One end of the coil spring 573 may be coupled tothe fixed cap 521. Even when the roller cover 582 rotates, the fixed cap521 may not rotate. Namely, the fixed cap 521 may be fixed.

The rotating cap 523 may be positioned at the other end of the auxiliaryroller 556. The rotating cap 523 may be positioned at the central axisof the auxiliary roller 556. The other end of the coil spring 573 may becoupled to the rotating cap 523. When the roller cover 582 rotates, therotating cap 523 may rotate at the same time as the roller cover 582.

When the roller cover 582 rotates, the fixed cap 521 on one side of theroller cover 582 may not rotate, and only the rotating cap 523 on theother side of the roller cover 582 may rotate together with the rollercover 582. Hence, the coil spring 573 may be wound. Namely, one end ofthe coil spring 573 connected to the fixed cap 521 may be fixed, and theother end of the coil spring 573 connected to the rotating cap 523 maybe wound while rotating. The coil spring 573 may store energy whilebeing wound.

As a result, as the protective sheet 472 is unwound, a force of theauxiliary roller 556 to rewind the protective sheet 472 may increase.Namely, when the display panel is unwound, the protective sheet 472 ofthe auxiliary roller 556 may be automatically wound. Further, as theprotective sheet 472 is wound, a force of the auxiliary roller 556 tounwind again the protective sheet 472 may increase. Namely, when thedisplay panel is wound, the protective sheet 472 of the auxiliary roller556 may be automatically unwound.

The shaft 547 may be the central axis of the auxiliary roller 556. Theshaft 547 may be connected to the fixed cap 521. The shaft 547 may beinserted into the coil spring 573. Hence, the shaft 547 can prevent thecoil spring 573 from moving when the coil spring 573 is wound.

The roller cover 582 may constitute the outer periphery of the auxiliaryroller 556. The roller cover 582 may shield the fixed cap 521, therotating cap 523, the shaft 547, and the coil spring 573. The rollercover 582 may be connected to one end of the protective sheet 472.Namely, the protective sheet 472 may be wound around the roller cover582.

Because the coil spring 573 of the auxiliary roller 556 stores energy,the display device according to the embodiment of the invention caneasily wind and unwind the protective sheet 472.

Referring to FIG. 28, when the display panel 10, that has been woundaround the panel roller 143, is unwound, a total radius R1 may increasebecause a diameter of the display panel 10 is added to a diameter of thepanel roller 14. Hence, the display panel 10 may move in a straight lineat a portion where the display panel 10 moves up and down to the outsideof the housing.

On the contrary, when the display panel 10, that has been unwound fromthe panel roller 143, is wound, only the diameter of the panel roller143 may constitute a total radius R2. Therefore, the total radius R2 maybe less than the total radius R1 when the display panel 10 is wound.Hence, the display panel 10 may slantly move at a predetermined angle A1at a portion where the display panel 10 moves up and down to the outsideof the housing. In this instance, the display panel 10 exposed to theoutside may be inclined to one side or may unstably move up and down.

Referring to FIG. 29, in the display device according to the embodimentof the invention, a guide assembly 731 may be coupled to the auxiliaryroller 556.

The auxiliary roller 556 may push the display panel 10 so as to preventthe display panel 10 from being inclined when the display panel 10 iswound and unwound, using the guide assembly 731. The guide assembly 731may move depending on a change in the diameter of the display panel 10and thus guide the display panel 10 to maintain a straight line in aportion contacting the auxiliary roller 556. A position of the auxiliaryroller 556 may change as the display panel 10 changes from the firststate to the second state. The auxiliary roller 556 may move on a rail583 formed inside the housing 30 and push the display panel 10.

The guide assembly 731 may include a guide arm 752, a pin bolt 761, atension spring 764, and a supporter 772. One end of the guide arm 752may be connected to the auxiliary roller 556, and the other end may beconnected to the tension spring 764. An extending direction of the guidearm 752 may change with respect to the pin bolt 761. Namely, the guidearm 752 may be inclined in different directions with respect to the pinbolt 761. When the auxiliary roller 556 moves on the rail 583, an angleof the guide arm 752 with respect to the pin bolt 761 may be changed.Namely, the guide arm 752 may rotate around the pin bolt 761 fixed tothe housing 30.

One end of the tension spring 764 may be connected to the guide arm 762,and the other end may be connected to the supporter 772. Because thesupporter 772 is fixed to the housing 30, the tension spring 764 may betensioned or compressed when the guide arm 762 rotates. The guide arm762 may be subjected to a force of rotation in a first direction (forexample, a clockwise direction) by the tension spring 764. Namely, theauxiliary roller 556 may receive a force of moving in the direction ofthe display panel 10. Hence, the auxiliary roller 556 may continuouslypush the display panel 10 so that the display panel 10 is not inclined.

When the display panel 10 changes from the first state to the secondstate, the auxiliary roller 556 may wind the protective sheet 472. Thus,a diameter of the auxiliary roller 556 may increase, and the center ofthe auxiliary roller 556 may move in a direction away from the frontsurface of the display panel 10 on the rail 583.

Hence, the guide arm 762 may rotate in a second direction opposite tothe first direction. For example, the guide arm 762 may rotate in acounterclockwise direction. As a result, the tension spring 764 may begradually extended, and the auxiliary roller 556 may push the displaypanel 10. Namely, as the display panel 10 changes from the first stateto the second state, the auxiliary roller 556 may push the display panel10 more strongly.

When the display panel 10 changes from the second state to the firststate, it can operate in reverse to the above. Namely, the auxiliaryroller 556 may be close to the front surface of the display panel 10. Asdescribed above, because the auxiliary roller 556 continuously pushesthe display panel 10 by the guide assembly 731, the display panel 10 maynot be inclined to one side.

The foregoing embodiments are merely examples and are not to beconsidered as limiting the present disclosure. The present teachings canbe readily applied to other types of methods and apparatuses. Thefeatures, structures, methods, and other characteristics of theembodiments described herein may be combined in various ways to obtainadditional and/or alternative embodiments.

Certain embodiments or other embodiments of the invention describedabove are not mutually exclusive or distinct from each other. Any or allelements of the embodiments of the invention described above may becombined or combined with each other in configuration or function.

Although embodiments have been described with reference to a number ofillustrative embodiments thereof, it should be understood that numerousother modifications and embodiments can be devised by those skilled inthe art that will fall within the scope of the principles of thisdisclosure. More particularly, various variations and modifications arepossible in the component parts and/or arrangements of the subjectcombination arrangement within the scope of the disclosure, the drawingsand the appended claims. In addition to variations and modifications inthe component parts and/or arrangements, alternative uses will also beapparent to those skilled in the art.

1-20. (canceled)
 21. A display device comprising: a housing; a pluralityof rollers positioned inside the housing; a display unit including adisplay panel and a module cover having at least one apron, of which atleast a portion of the display panel and the at least one apron isconnected to each other; and a motor assembly; an upper bar coupled toan upper part of the display unit; and at least one support portionhaving one side coupled to an end of the upper bar and having anotherside coupled to the motor assembly, the at least one support portionmoving the upper bar up and down with an operation of the motorassembly, wherein the plurality of rollers include a panel roller andthe display panel and the module cover in a first state, are wound onthe panel roller, and in a second state, are unwound from the panelroller, and are exposed to an outside of the housing, and wherein theplurality of rollers further include an auxiliary roller that ispositioned adjacent to the panel roller and moves to wind and unwind ina counter-direction to that of the panel roller.
 22. The display deviceof claim 21, further comprising a protective sheet positioned inside thehousing and wound around the auxiliary roller, and making contact withthe display panel when the auxiliary roller unwinds the protectivesheet.
 23. The display device of claim 22, wherein one end of theprotective sheet is connected to the auxiliary roller, and another endof the protective sheet is connected to one end of the display panel.24. The display device of claim 22, wherein the protective sheetincludes a nonwoven fabric.
 25. The display device of claim 21, whereinthe auxiliary roller includes: a fixed cap fixed to one end of theauxiliary roller; a rotating cap positioned at another end of theauxiliary roller and being rotatable; and a coil spring of which one endis connected to the fixed cap and another end is connected to therotating cap.
 26. The display device of claim 25, wherein, one end ofthe coil spring connected to the fixed cap is fixed, and the another endof the coil spring connected to the rotating cap is rotatable, and thecoil spring stores energy when the coil spring is wound by a rotation ofthe auxiliary roller.
 27. The display device of claim 21, wherein whenthe display panel transitions from the first state to the second state,a position of the auxiliary roller within the housing changes.
 28. Thedisplay device of claim 27, wherein a front surface of the display panelis closer to the auxiliary roller in the first state than the auxiliaryroller in the second state.
 29. The display device of claim 28, furthercomprising a rail inside the housing, wherein the auxiliary roller ismovable along the rail.
 30. The display device of claim 29, furthercomprising a guide assembly connected to the auxiliary roller.
 31. Thedisplay device of claim 30, wherein the guide assembly guides theauxiliary roller to move towards the front surface of the display panelwhen the display panel transitions from the second state to the firststate.
 32. The display device of claim 30, wherein the guide assemblyincludes: a guide arm of which one end is connected to the auxiliaryroller; and a tension spring of which one end is connected to anotherend of the guide arm.
 33. The display device of claim 32, wherein as theauxiliary roller moves, the guide arm rotates.
 34. The display device ofclaim 33, wherein as the auxiliary roller moves away from the frontsurface of the display panel, the guide arm rotates in acounterclockwise direction.
 35. The display device of claim 32, whereinas the guide arm rotates, a length of the tension spring changes. 36.The display device of claim 35, wherein as the auxiliary roller movesaway from the front surface of the display panel, the length of thetension spring increases.
 37. The display device of claim 32, whereinthe guide assembly further includes a pin bolt that is positioned in acenter of the guide arm and fixes the guide arm to the housing.
 38. Thedisplay device of claim 37, wherein an extending direction of the guidearm changes with respect to the pin bolt.
 39. The display device ofclaim 37, wherein when the display panel transitions from the firststate to the second state, the guide arm rotates around the pin bolt.40. The display device of claim 32, wherein the guide assembly furtherincludes a supporter that is connected to the another end of the tensionspring and is fixed to the housing.